/[pcre]/code/trunk/pcre_maketables.c
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Contents of /code/trunk/pcre_maketables.c

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Revision 87 - (show annotations) (download)
Sat Feb 24 21:41:21 2007 UTC (7 years, 5 months ago) by nigel
File MIME type: text/plain
File size: 5456 byte(s)
Load pcre-6.5 into code/trunk.

1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2006 University of Cambridge
10
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39
40
41 /* This module contains the external function pcre_maketables(), which builds
42 character tables for PCRE in the current locale. The file is compiled on its
43 own as part of the PCRE library. However, it is also included in the
44 compilation of dftables.c, in which case the macro DFTABLES is defined. */
45
46
47 #ifndef DFTABLES
48 #include "pcre_internal.h"
49 #endif
50
51
52 /*************************************************
53 * Create PCRE character tables *
54 *************************************************/
55
56 /* This function builds a set of character tables for use by PCRE and returns
57 a pointer to them. They are build using the ctype functions, and consequently
58 their contents will depend upon the current locale setting. When compiled as
59 part of the library, the store is obtained via pcre_malloc(), but when compiled
60 inside dftables, use malloc().
61
62 Arguments: none
63 Returns: pointer to the contiguous block of data
64 */
65
66 const unsigned char *
67 pcre_maketables(void)
68 {
69 unsigned char *yield, *p;
70 int i;
71
72 #ifndef DFTABLES
73 yield = (unsigned char*)(pcre_malloc)(tables_length);
74 #else
75 yield = (unsigned char*)malloc(tables_length);
76 #endif
77
78 if (yield == NULL) return NULL;
79 p = yield;
80
81 /* First comes the lower casing table */
82
83 for (i = 0; i < 256; i++) *p++ = tolower(i);
84
85 /* Next the case-flipping table */
86
87 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
88
89 /* Then the character class tables. Don't try to be clever and save effort on
90 exclusive ones - in some locales things may be different. Note that the table
91 for "space" includes everything "isspace" gives, including VT in the default
92 locale. This makes it work for the POSIX class [:space:]. Note also that it is
93 possible for a character to be alnum or alpha without being lower or upper,
94 such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at
95 least under Debian Linux's locales as of 12/2005). So we must test for alnum
96 specially. */
97
98 memset(p, 0, cbit_length);
99 for (i = 0; i < 256; i++)
100 {
101 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
102 if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
103 if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
104 if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
105 if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
106 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
107 if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
108 if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
109 if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
110 if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
111 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
112 }
113 p += cbit_length;
114
115 /* Finally, the character type table. In this, we exclude VT from the white
116 space chars, because Perl doesn't recognize it as such for \s and for comments
117 within regexes. */
118
119 for (i = 0; i < 256; i++)
120 {
121 int x = 0;
122 if (i != 0x0b && isspace(i)) x += ctype_space;
123 if (isalpha(i)) x += ctype_letter;
124 if (isdigit(i)) x += ctype_digit;
125 if (isxdigit(i)) x += ctype_xdigit;
126 if (isalnum(i) || i == '_') x += ctype_word;
127
128 /* Note: strchr includes the terminating zero in the characters it considers.
129 In this instance, that is ok because we want binary zero to be flagged as a
130 meta-character, which in this sense is any character that terminates a run
131 of data characters. */
132
133 if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta; *p++ = x; }
134
135 return yield;
136 }
137
138 /* End of pcre_maketables.c */

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